APTuner takes one of the most widely used chromatic tuners and places it in your mobile phone and tablet. Built around an improved version of our pitch recognition engine, APTuner allows you to quickly and accurately tune your instrument using your phone's built-in mic. Beautifully designed user interface is focused on only one task: perfectly tuning your instrument. True 8 octave strobe display. Every audio sample is fed through the GPU to calculate the real stroboscopic effect-exactly like a mechanical spinning disk. Looks absolutely amazing in landscape on a retina display! Performance Analysis screen. APTuner can analyze and display your pitch and loudness over time. Perfect for improving your tonal quality, scales, dynamics or measuring how well you are holding your tone and volume. The product family has been downloaded over 15 million times and used by countless professional musicians, instructors, instrument builders, and studios. Features: + Automatically detects the note and cent deviation for a wide variety of instruments + True 8 octave stroboscopic display + Graph pitch and loudness over time + Precise up to 1/1000 semitone (0.1 cent) + High contrast, high visibility user interface + User selectable noise threshold + Settable A4 frequency + Temperament Support Endorsements: + I've used your product for ever it seems, likely every day. Recommend it to every guitar player I know that owns a computer. + Easy to use, intelligent, and versatile. Slick. + Quick response time, Great display, can see it across the room! + A very good product indeed. My teacher says that it has really helped me to improve my pitch placement. Thank you for all your hard work on this. + My guitar has never sounded sweeter.